Enable cpplint and fix cpplint errors in webrtc/*audio

webrtc/common_audio/ring_buffer_unittest.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 40 matching lines @@
 // failure.
 static void RandomStressTest(int** data_ptr) {
   const int kNumTests = 10;
   const int kNumOps = 1000;
   const int kMaxBufferSize = 1000;
 
   unsigned int seed = time(nullptr);
   printf("seed=%u\n", seed);
   srand(seed);
   for (int i = 0; i < kNumTests; i++) {
-    const int buffer_size = std::max(rand() % kMaxBufferSize, 1);
+    // rand_r is not supported on many platforms, so rand is used.
+    const int buffer_size = std::max(rand() % kMaxBufferSize, 1);  // NOLINT
     std::unique_ptr<int[]> write_data(new int[buffer_size]);
     std::unique_ptr<int[]> read_data(new int[buffer_size]);
     scoped_ring_buffer buffer(WebRtc_CreateBuffer(buffer_size, sizeof(int)));
     ASSERT_TRUE(buffer.get() != nullptr);
     WebRtc_InitBuffer(buffer.get());
     int buffer_consumed = 0;
     int write_element = 0;
     int read_element = 0;
     for (int j = 0; j < kNumOps; j++) {
-      const bool write = rand() % 2 == 0 ? true : false;
-      const int num_elements = rand() % buffer_size;
+      const bool write = rand() % 2 == 0 ? true : false;  // NOLINT
+      const int num_elements = rand() % buffer_size;  // NOLINT
       if (write) {
         const int buffer_available = buffer_size - buffer_consumed;
         ASSERT_EQ(static_cast<size_t>(buffer_available),
                   WebRtc_available_write(buffer.get()));
         const int expected_elements = std::min(num_elements, buffer_available);
         write_element = SetIncrementingData(write_data.get(), expected_elements,
                                      write_element);
         ASSERT_EQ(static_cast<size_t>(expected_elements),
                   WebRtc_WriteBuffer(buffer.get(), write_data.get(),
                                      num_elements));
@@ skipping 58 matching lines @@
 
 TEST(RingBufferTest, CreateHandlesErrors) {
   EXPECT_TRUE(WebRtc_CreateBuffer(0, 1) == nullptr);
   EXPECT_TRUE(WebRtc_CreateBuffer(1, 0) == nullptr);
   RingBuffer* buffer = WebRtc_CreateBuffer(1, 1);
   EXPECT_TRUE(buffer != nullptr);
   WebRtc_FreeBuffer(buffer);
 }
 
 }  // namespace webrtc